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Describe the structure of DNA molecules.
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DNA molecules have a double helix structure, with two strands of deoxyribonucleic acid (DNA) wound around each other. Each strand consists of four nitrogenous bases; adenine, thymine, guanine, and cytosine, paired in a specific order. The complementary pairing of nitrogenous bases structurally stabilizes the double helix, and forms the basis for genetic information storage, replication, and expression.